CN112413149B

CN112413149B - Electronic expansion valve and mounting method thereof

Info

Publication number: CN112413149B
Application number: CN201910775851.6A
Authority: CN
Inventors: 李建军; 曾庆军; 陈勇好
Original assignee: Zhejiang DunAn Hetian Metal Co Ltd
Current assignee: Zhejiang DunAn Hetian Metal Co Ltd
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2022-02-11
Anticipated expiration: 2039-08-21
Also published as: WO2021031682A1; KR102624431B1; KR20220024970A; JP2022545152A; JP7356521B2; CN112413149A

Abstract

The invention provides an electronic expansion valve and an installation method thereof. Wherein, electronic expansion valve includes: a valve seat assembly; the nut assembly comprises a small-diameter section and a large-diameter section which are connected in sequence, the large-diameter section is connected with the valve seat assembly, the small-diameter section is provided with a first stopping bulge, and the large-diameter section is provided with a second stopping bulge; the valve needle assembly penetrates through the nut assembly, the lower end of the valve needle assembly is provided with a valve needle section, and the upper end of the valve needle assembly is in threaded connection with the nut assembly; the rotor subassembly, the rotor subassembly passes through top and needle subassembly fixed connection to drive valve needle subassembly and rotate, the rotor subassembly has the third backstop arch, and the protruding inward protrusion of position from the rotor subassembly bottom of third backstop extends the setting, and when electronic expansion valve is full-open, the protruding butt of third backstop and first backstop, when electronic expansion valve is totally closed, the protruding butt of third backstop and second backstop. The invention solves the problem of higher noise in the operation process of the electronic expansion valve in the prior art.

Description

Electronic expansion valve and mounting method thereof

Technical Field

The invention relates to the technical field of valves, in particular to an electronic expansion valve and an installation method thereof.

Background

The full-open and full-close limiting function of the electronic expansion valve in the prior art is realized by the common action of the spring guide rail, the sliding ring and the stop rod arranged on the rotor, when the valve body is driven, the stop rod rotates along with the rotor, the sliding ring is stirred to slide in the stroke of the spring guide rail, and two defects exist in the structure:

1. the three parts are all made of metal materials, metal impact noise is large in the operation process, particularly in the existing multi-split air conditioner system, the electronic expansion valve is arranged on the indoor side, and the operation noise emitted by the electronic expansion valve cannot meet the comfortable use requirement of people;

2. when the spring guide rail is installed, only the end is fixed, the other end is not fixed and is in a free state, and the spring guide rail is easy to deform, so that the position precision of the sliding ring is insufficient, especially when the electronic expansion valve is reset, the fluctuation of the initial position of the sliding ring is large, the flow regulation precision of the electronic expansion valve is insufficient, and the energy efficiency of an air conditioning system is influenced.

Disclosure of Invention

The invention mainly aims to provide an electronic expansion valve and an installation method thereof, and aims to solve the problem that the noise is high in the operation process of the electronic expansion valve in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided an electronic expansion valve comprising: the valve seat assembly is provided with a first connecting port and a second connecting port which are communicated with an external pipeline; the nut assembly comprises a small-diameter section and a large-diameter section which are connected in sequence, the large-diameter section is connected with the valve seat assembly, the small-diameter section is provided with a first stopping bulge, and the large-diameter section is provided with a second stopping bulge; the valve needle assembly penetrates through the nut assembly, the lower end of the valve needle assembly is provided with a valve needle section, and the upper end of the valve needle assembly is in threaded connection with the nut assembly; the rotor subassembly, the rotor subassembly passes through top and needle subassembly fixed connection, and drive valve needle subassembly and rotate, the axial motion of valve needle subassembly along electronic expansion valve, in order to control the break-make state between first connector and the second connector, the rotor subassembly has the third backstop arch, and the protruding inward protrusion of position from the rotor subassembly bottom of third backstop extends the setting, when electronic expansion valve is full-open, the protruding butt with first backstop of third backstop, when electronic expansion valve is totally closed, the protruding butt of third backstop and second backstop.

Further, the needle subassembly includes reducing section, hole enlargement section and the needle section of connecting in order, and the needle subassembly stretches into to the nut subassembly by the major diameter section in, and the reducing section is located minor diameter section department, and the hole enlargement section is located major diameter section department, and the needle section is located the valve seat subassembly, minor diameter section and reducing section threaded connection.

Further, the rotor assembly includes: the rotor is of an inverted U-shaped structure and covers the outer side of the nut component, the third stopping bulge is positioned on the inner side of the rotor, and the valve needle component penetrates through the end face of the rotor; the inserts are arranged between the end face of the rotor and the valve needle assembly, the rotor drives the valve needle assembly to rotate through the inserts, the end face of the rotor is provided with a demolding hole, and the demolding hole is opposite to the third stopping protrusion along the axial direction of the rotor assembly.

Further, the nut assembly includes: the nut is provided with a large-diameter section and a small-diameter section; the connecting plate is arranged on the outer side of the nut and is integrally injection-molded with the nut, and the connecting plate is connected with the valve seat assembly.

Further, the length of the first stopping projection is different from the length of the second stopping projection.

Further, the distance from the end of the first stop projection to the center line of the nut is equal to the distance from the end of the second stop projection to the center line of the nut.

Further, the outside of major diameter section has a plurality of location muscle, location muscle and valve seat assembly's inner wall butt, and each location muscle sets up along the circumference of major diameter section.

Further, a gap is formed between the outer wall of the large-diameter section, which is not provided with the positioning rib, and the inner wall of the valve seat assembly, a via hole is formed in the connecting plate, and the via hole is communicated with the gap to form a channel for fluid to pass through.

Furthermore, the nut is also provided with a balance hole, and the balance hole is opened towards the axis of the nut.

Furthermore, the end face of the large-diameter section, which is close to the small-diameter section, is provided with a positioning step, and the third stopping protrusion can abut against the positioning step to control the movement range of the rotor assembly.

Furthermore, the first stopping protrusion, the second stopping protrusion and the third stopping protrusion are plastic parts.

Furthermore, the electronic expansion valve further comprises a sleeve, the sleeve is connected with the valve seat assembly and forms an accommodating cavity with the valve seat assembly, the first connecting port and the second connecting port are located outside the accommodating cavity, and the nut assembly, the valve needle assembly and the rotor assembly are located in the accommodating cavity.

Further, the valve seat assembly comprises: the valve seat is provided with a first connecting port and a second connecting port, and one part of the nut component extends into the valve seat; the sleeve seat is arranged on the outer side of the valve seat and connected with the valve seat, and the sleeve is connected with the sleeve seat.

According to another aspect of the present invention, there is provided a method for installing an electronic expansion valve, where the electronic expansion valve is the electronic expansion valve described above, the method includes: assembling the components of the valve seat assembly of the electronic expansion valve together; assembling all parts of a valve needle assembly of the electronic expansion valve together; the diameter reducing section of the valve needle assembly extends into the nut assembly from the large-diameter section of the nut assembly of the electronic expansion valve and is screwed into the small-diameter section of the nut assembly; mounting a nut assembly to a seat assembly; installing a rotor assembly of the electronic expansion valve outside the nut assembly, abutting a third stopping bulge of the rotor assembly with a second stopping bulge of the nut assembly, adjusting the distance that the valve needle assembly extends into the valve seat assembly to fully close the electronic expansion valve, and connecting the valve needle assembly with the rotor assembly; and sleeving a sleeve of the electronic expansion valve outside the rotor assembly and connecting the sleeve with the valve seat assembly.

By applying the technical scheme of the invention, the valve needle assembly is driven to rotate by the rotor assembly, the nut assembly is fixedly arranged relative to the valve seat assembly, the valve needle assembly rotates and moves axially at the same time because the valve needle assembly is connected with the nut assembly through the thread structure, when the valve needle assembly moves to the full opening of the electronic expansion valve, the third stopping bulge on the rotor assembly is abutted with the first stopping bulge on the nut assembly, so that the rotor assembly cannot rotate continuously, and when the valve needle assembly moves to the full closing of the electronic expansion valve, the third stopping bulge on the rotor assembly is abutted with the second stopping bulge on the nut assembly, so that the rotor assembly cannot rotate continuously. The above arrangement mode does not need to adopt parts such as a spring, a sliding ring and the like, and the electronic expansion valve can be opened and closed by directly driving the valve needle assembly to rotate through the rotor assembly, so that the problem of high noise caused by metal impact is avoided. And because the protruding both ends with the rotor subassembly of third backstop all keep the certain distance, the protruding tip that is not located the rotor subassembly of third backstop, the protruding center that is apart from the rotor subassembly of third backstop is nearer like this, the arm of force sets up more optimally, when making the backstop atress more reasonable, the bulk strength of rotor subassembly has been improved, and can not produce the interference to the magnetism of rotor subassembly tip, make along the axial of rotor subassembly, the protruding both sides of third backstop all have the magnetic action, the rotor subassembly can receive the magnetic action of circular telegram coil better, the rotor subassembly is bigger with the just area of outside magnetic ring, the stroke demand of needle subassembly has further been optimized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of the electronic expansion valve of the present invention in a fully open configuration;

FIG. 2 is a schematic diagram of the electronic expansion valve of FIG. 1 when fully closed;

FIG. 3 is a schematic view illustrating a structure of a rotor assembly of the electronic expansion valve of FIG. 1;

FIG. 4 shows a top view of FIG. 3;

FIG. 5 is a schematic diagram illustrating a nut assembly and a valve seat assembly of the electronic expansion valve of FIG. 1; and

fig. 6 is a schematic view illustrating a nut assembly of the electronic expansion valve of fig. 1.

Wherein the figures include the following reference numerals:

10. a valve seat assembly; 11. a first connection port; 12. a second connection port; 13. a valve seat; 14. a cannula holder; 20. a nut assembly; 21. a small diameter section; 211. a first stopper projection; 22. a large diameter section; 221. a second stopper projection; 23. a nut; 24. a connecting plate; 241. a via hole; 25. positioning ribs; 26. a balance hole; 27. positioning a step; 30. a valve needle assembly; 31. a reducing section; 32. a diameter expanding section; 33. a valve needle section; 40. a rotor assembly; 41. a third stopper projection; 42. a rotor; 43. an insert; 44. demoulding holes; 50. a sleeve.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

The invention provides an electronic expansion valve and an installation method thereof, aiming at solving the problem of higher noise in the operation process of the electronic expansion valve in the prior art.

An electronic expansion valve as shown in fig. 1 to 6 comprises a valve seat assembly 10, a nut assembly 20, a valve needle assembly 30 and a rotor assembly 40, wherein the valve seat assembly 10 is provided with a first connecting port 11 and a second connecting port 12 which are communicated with external pipelines; the nut assembly 20 comprises a small-diameter section 21 and a large-diameter section 22 which are connected in sequence, the large-diameter section 22 is connected with the valve seat assembly 10, the small-diameter section 21 is provided with a first stopping projection 211, and the large-diameter section 22 is provided with a second stopping projection 221; the valve needle assembly 30 is arranged through the nut assembly 20, the lower end of the valve needle assembly is provided with a valve needle section 33, and the upper end of the valve needle assembly is in threaded connection with the nut assembly 20; the rotor assembly 40 is fixedly connected with the valve needle assembly 30 through the top, and drives the valve needle assembly 30 to rotate, the valve needle assembly 30 moves along the axial direction of the electronic expansion valve, so as to control the on-off state between the first connecting port 11 and the second connecting port 12, the rotor assembly 40 is provided with a third stopping protrusion 41, the third stopping protrusion 41 protrudes inwards from the position deviated from the bottom of the rotor assembly 40 and extends, when the electronic expansion valve is fully opened, the third stopping protrusion 41 is abutted to the first stopping protrusion 211, and when the electronic expansion valve is fully closed, the third stopping protrusion 41 is abutted to the second stopping protrusion 221.

In the embodiment, the valve needle assembly 30 is driven to rotate by the rotor assembly 40, the nut assembly 20 is fixedly arranged relative to the valve seat assembly 10, because the valve needle assembly 30 is connected with the nut assembly 20 through the threaded structure, the valve needle assembly 30 moves axially while rotating, when the valve needle assembly 30 moves to the full-open electronic expansion valve, as shown in fig. 1, the third stopping protrusion 41 on the rotor assembly 40 abuts against the first stopping protrusion 211 on the nut assembly 20, so that the rotor assembly 40 cannot continue to rotate, and when the valve needle assembly 30 moves to the full-closed electronic expansion valve, as shown in fig. 2, the third stopping protrusion 41 on the rotor assembly 40 abuts against the second stopping protrusion 221 on the nut assembly 20, so that the rotor assembly 40 cannot continue to rotate. The above arrangement mode does not need to adopt parts such as a spring, a slip ring and the like, and the electronic expansion valve can be opened and closed by directly driving the valve needle assembly 30 to rotate through the rotor assembly 40, so that the problem of high noise caused by metal impact is avoided. And because the protruding 41 of third backstop all keeps the certain distance with the both ends of rotor subassembly 40, the protruding 41 of third backstop is not located the tip of rotor subassembly 40 promptly, the protruding 41 of third backstop is nearer apart from the center of rotor subassembly 40 like this, the arm of force sets up more excellently, when making the backstop atress more reasonable, the bulk strength of rotor subassembly 40 has been improved, and is more durable, and can not produce the magnetic interference to the tip of rotor subassembly 40, make along the axial of rotor subassembly 40, the both sides of the protruding 41 of third backstop all have the magnetic action, rotor subassembly 40 can better receive the magnetic action of circular telegram coil, rotor subassembly 40 is bigger with the just right area of outside magnetic ring, the stroke demand of needle subassembly 30 has further been optimized.

In the present embodiment, the valve needle assembly 30 includes a reducing section 31, an expanding section 32 and a valve needle section 33 which are connected in sequence, the valve needle assembly 30 extends into the nut assembly 20 from the large diameter section 22, the reducing section 31 is located at the small diameter section 21, the expanding section 32 is located at the large diameter section 22, the valve needle section 33 is located in the valve seat assembly 10, and the small diameter section 21 is in threaded connection with the reducing section 31. The valve needle assembly 30 of the embodiment includes a valve needle, a gasket, a spring, a bushing, a spring sleeve and a screw, wherein the valve needle is used as a valve needle section 33, the spring sleeve is used as an expanding section 32, the screw is used as a reducing section 31, the valve needle extends into the valve seat 13 to realize on-off control of the first connecting port 11 and the second connecting port 12, one end of the valve needle far away from the first connecting port 11 is abutted to the gasket, the screw extends into the nut 23 and is in threaded connection with the nut 23, the spring is simultaneously sleeved on the screw and the gasket, and two ends of the spring are respectively abutted to the screw and the gasket, so that the screw and the gasket have a moving trend of being far away from each other, a small gap is left between the screw and the gasket, when the rotor assembly 40 drives the screw to move slightly more, the valve needle and the gasket cannot move continuously due to the abutment to the valve seat 13, at the screw can continue to compress the spring without driving the gasket to move, so that the movement of the screw has a certain margin, the spring sleeve is sleeved on the outer side of the spring and connected with the screw rod and the gasket, so that the spring is protected.

As shown in fig. 3 and 4, the rotor assembly 40 includes a rotor 42 and an insert 43, the rotor 42 is of an inverted U-shaped structure and covers the outer side of the nut assembly 20, the third stopping protrusion 41 is located on the inner side of the rotor 42 and extends out along the radial direction of the rotor 42, one end of the rotor 42 facing the valve seat assembly 10 is open, one end of the rotor 42 facing away from the valve seat assembly 10 is closed, the valve needle assembly 30 penetrates through the end face of the closed end of the rotor 42 and is integrally injection-molded with the rotor 42, the insert 43 is of a sleeve shape, the insert 43 is sleeved on the valve needle assembly 30 and is located between the end face of the rotor 42 and the valve needle assembly 30, that is, the rotor 42 is in driving connection with the valve needle assembly 30 through the insert 43, so that the rotor 42 drives the valve needle assembly 30 to rotate through the insert 43 to drive the valve needle assembly 30. In addition, the end face of the rotor 42 is provided with a demolding hole 44, and along the axial direction of the rotor assembly 40, the demolding hole 44 is over against the third stopping protrusion 41, and the demolding hole 44 facilitates a demolding process and facilitates processing of the third stopping protrusion 41.

As shown in fig. 5 and 6, the nut assembly 20 includes a nut 23 and a web 24, the nut 23 being the most important component of the nut assembly 20, having a large diameter section 22 and a small diameter section 21; the connecting plate 24 is disposed outside the nut 23 and is integrally injection-molded with the nut 23, and when the nut 23 is mounted on the valve seat assembly 10, the connecting plate 24 abuts against the valve seat assembly 10 to explain that the nut assembly 20 is mounted in place, and then the connecting plate 24 and the valve seat assembly 10 are connected together by means of laser welding or the like.

Optionally, since the first stopping protrusion 211 and the second stopping protrusion 221 extend radially from the sections of the nut 23 with different diameters, the length of the first stopping protrusion 211 is different from that of the second stopping protrusion 221, and preferably, the distance from the end of the first stopping protrusion 211 to the center line of the nut 23 is equal to that from the second stopping protrusion 221 to the center line of the nut 23, so as to ensure that both the first stopping protrusion 211 and the second stopping protrusion 221 can reliably abut against the third stopping protrusion 41 to achieve the limiting effect.

As shown in fig. 6, the outside of the large diameter section 22 has a plurality of positioning ribs 25, the positioning ribs 25 extend in the axial direction of the large diameter section 22, and when the large diameter section 22 is installed in the valve seat assembly 10, the positioning ribs 25 are in interference fit with the inner wall of the valve seat assembly 10, thereby ensuring the coaxiality of installation. The number of the positioning ribs 25 is generally 3-4, and the positioning ribs 25 are arranged at equal intervals along the circumferential direction of the large-diameter section 22.

Because the positioning rib 25 is located between the outer wall of the large-diameter section 22 and the inner wall of the valve seat assembly 10, a gap is naturally formed between the outer wall of the large-diameter section 22, which is not provided with the positioning rib 25, and the inner wall of the valve seat assembly 10 as a balance cavity, and the connecting plate 24 is provided with a via hole 241, and the via hole 241 is communicated with the gap and forms a balance channel for fluid to pass through.

Optionally, the nut 23 also has a balancing hole 26, the balancing hole 26 penetrating the nut 23 from the outside of the nut 23 toward the axis of the nut 23. The balancing holes 26 are preferably formed in the radial direction of the nut 23, but may be formed obliquely at a certain angle.

In the present embodiment, the end surface of the large diameter section 22 close to the small diameter section 21 is formed with a positioning step 27, the positioning step 27 cooperates with the second stopping protrusion 221 to stop the movement of the third stopping protrusion 41 together, and when the third stopping protrusion 41 abuts against the second stopping protrusion 221, the third stopping protrusion 41 also abuts against the positioning step 27, thereby controlling the movement range of the rotor assembly 40 more reliably.

In this embodiment, the first stopping protrusion 211, the second stopping protrusion 221 and the third stopping protrusion 41 are all plastic parts. Because of the plastic part, the impact sound is less when the stop is limited. In addition, the three stop bulges are injection molded in the die, the precision of the die is high, the size consistency is good, when the electronic expansion valve is reset, the rebound condition does not exist, the initial position consistency is good, and the flow precision of the electronic expansion valve is improved.

Preferably, since only the rotor assembly 40 needs to have magnetism, the nut assembly 20 has no magnetism requirement, so that the nut 23 is a pure plastic part as a whole, and the rotor 42 is made of magnetic powder added into plastic, so as to achieve the effect of reducing impact sound while meeting the magnetism requirement of the rotor 42. The insert 43 can be provided as a metal part since it does not collide.

As shown in fig. 1 and 2, the electronic expansion valve further includes a sleeve 50, the sleeve 50 is connected to the valve seat assembly 10 and forms a receiving cavity with the valve seat assembly 10, the first connection port 11 and the second connection port 12 are located outside the receiving cavity, and the nut assembly 20, the valve needle assembly 30 and the rotor assembly 40 are located in the receiving cavity. The sleeve 50 protects the structure of the electronic expansion valve which is not exposed under the condition that the normal use of the electronic expansion valve is not influenced, and meanwhile, the electrified coil can be wound on the outer side of the sleeve 50 to drive the rotor 42.

In this embodiment, the valve seat assembly 10 includes a valve seat 13 and a sleeve seat 14, the valve seat 13 has a first connection port 11 and a second connection port 12, a large diameter section 22 of a nut 23 extends into the valve seat 13 and is in interference fit with the valve seat 13, when the large diameter section 22 is installed in the valve seat 13 by press fitting or the like, a connection plate 24 abuts against the sleeve seat 14 to indicate that the casing seat is installed in place, the valve seat 13 serves as a base component of the electronic expansion valve to provide a base support, the sleeve seat 14 is disposed outside the valve seat 13 and is connected with the valve seat 13, the sleeve 50 is connected with the sleeve seat 14, the sleeve seat 14 is used for installing the sleeve 50, and a coil disk can be further disposed on the sleeve seat 14 for combing and winding coils.

The embodiment also provides an installation method of the electronic expansion valve, wherein the electronic expansion valve is the electronic expansion valve, and the installation method comprises the following steps:

assembling all parts of a valve seat assembly 10 of the electronic expansion valve together, and welding a valve seat 13, an external connecting pipe and a sleeve seat 14 together to form the valve seat assembly 10; and assembling the parts of the valve needle assembly 30 of the electronic expansion valve together, and assembling the valve needle, the gasket, the spring, the bushing, the spring housing and the screw together to form the valve needle assembly 30; then, the reducing section 31 of the valve needle assembly 30 extends into the nut assembly 20 from the large-diameter section 22 of the nut assembly 20 of the electronic expansion valve and is screwed into the small-diameter section 21 of the nut assembly 20, then the nut assembly 20 is installed on the valve seat assembly 10, and the connecting plate 24 and the sleeve seat 14 are welded together through laser welding; mounting a rotor assembly 40 of the electronic expansion valve outside the nut assembly 20, abutting a side surface of a third stopping protrusion 41 of the rotor assembly 40 with a second stopping protrusion 221 of the nut assembly 20 and abutting the other side surface of the third stopping protrusion 41 with a positioning step 27 on the nut 23, then adjusting the position of the valve needle assembly 30, adjusting the distance that the valve needle assembly 30 extends into the valve seat assembly 10, screwing the valve needle assembly 30 to a 0-pulse position to completely close the electronic expansion valve, after the adjustment is completed, when the third stopping protrusion 41 abuts with the second stopping protrusion 221, the electronic expansion valve is in a completely closed state, and then laser welding the screw and the insert 43 together; finally, the sleeve 50 of the electronic expansion valve is sleeved outside the rotor assembly 40 and is laser welded with the sleeve seat 14, so that the assembly of the electronic expansion valve can be completed.

It should be noted that, a plurality in the above embodiments means at least two.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. the problem of high noise in the operation process of the electronic expansion valve in the prior art is solved;

2. the third stopping bulge is closer to the center, the force arm is better, the overall strength is higher, and the third stopping bulge is more durable;

3. the third stopping bulge cannot interfere with the magnetism of the end part of the rotor assembly, the rotor assembly can better receive the magnetic force of the electrified coil, the dead-against area of the rotor assembly is larger, and the stroke requirement of the valve needle assembly can be met;

4. the sound of striking is less when the working of plastics backstop is spacing to the precision of mould is high, and its dimensional consistency is good.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic expansion valve, comprising:

a valve seat assembly (10), wherein the valve seat assembly (10) is provided with a first connecting port (11) and a second connecting port (12) which are communicated with an external pipeline;

a nut assembly (20), wherein the nut assembly (20) comprises a small-diameter section (21) and a large-diameter section (22) which are sequentially connected, the large-diameter section (22) is connected with the valve seat assembly (10), the small-diameter section (21) is provided with a first stopping projection (211), the large-diameter section (22) is provided with a second stopping projection (221), the length of the first stopping projection (211) is different from that of the second stopping projection (221), and the distance from the end part of the first stopping projection (211) to the central line of the nut assembly (20) is equal to that from the second stopping projection (221) to the central line of the nut assembly (20);

a valve needle assembly (30), wherein the valve needle assembly (30) penetrates through the nut assembly (20), the lower end of the valve needle assembly is provided with a valve needle section (33), and the upper end of the valve needle assembly is in threaded connection with the nut assembly (20);

rotor subassembly (40), rotor subassembly (40) through the top with needle subassembly (30) fixed connection, and the drive needle subassembly (30) rotate, needle subassembly (30) are followed electronic expansion valve's axial motion, in order to control first connecting port (11) with break-make state between second connector (12), rotor subassembly (40) have third backstop arch (41), just third backstop arch (41) self-bias rotor subassembly (40) bottom the position protrusion extends the setting inwards, works as when electronic expansion valve is full-open, third backstop arch (41) with first backstop arch (211) butt, works as when electronic expansion valve is totally closed, third backstop arch (41) with second backstop arch (221) butt.

2. The electronic expansion valve according to claim 1, wherein the valve needle assembly (30) comprises a reducing section (31), an expanding section (32) and the valve needle section (33) which are connected in sequence, the valve needle assembly (30) extends from the large diameter section (22) into the nut assembly (20), the reducing section (31) is located at the small diameter section (21), the expanding section (32) is located at the large diameter section (22), the valve needle section (33) is located in the valve seat assembly (10), and the small diameter section (21) is in threaded connection with the reducing section (31).

3. An electronic expansion valve according to claim 1, wherein the rotor assembly (40) comprises:

the rotor (42) is of an inverted U-shaped structure and covers the outer side of the nut component (20), the third stopping protrusion (41) is located on the inner side of the rotor (42), and the valve needle component (30) penetrates through the end face of the rotor (42);

the insert (43) is arranged between the end face of the rotor (42) and the valve needle assembly (30), the rotor (42) drives the valve needle assembly (30) to rotate through the insert (43), a demolding hole (44) is formed in the end face of the rotor (42), the demolding hole (44) is arranged along the axial direction of the rotor assembly (40), and the demolding hole (44) is right opposite to the third stopping protrusion (41).

4. An electronic expansion valve according to claim 1, wherein the nut assembly (20) comprises:

a nut (23), said nut (23) having said large diameter section (22) and said small diameter section (21);

the connecting plate (24) is arranged on the outer side of the nut (23) and is integrally injection-molded with the nut (23), and the connecting plate (24) is connected with the valve seat assembly (10).

5. An electronic expansion valve according to claim 4, wherein the outer side of the large diameter section (22) has a plurality of positioning ribs (25), the positioning ribs (25) abutting against the inner wall of the valve seat assembly (10), each positioning rib (25) being arranged along the circumferential direction of the large diameter section (22).

6. An electronic expansion valve according to claim 5, wherein the outer wall of the large diameter section (22) not provided with the positioning ribs (25) forms a gap with the inner wall of the valve seat assembly (10), and the connecting plate (24) is provided with a through hole (241), and the through hole (241) communicates with the gap and forms a passage for fluid to pass through.

7. An electronic expansion valve according to claim 4, wherein the nut (23) further has a balancing hole (26), the balancing hole (26) opening towards the axis of the nut (23).

8. An electronic expansion valve according to claim 1, wherein the end surface of the large diameter section (22) close to the small diameter section (21) is formed with a positioning step (27), and the third stop protrusion (41) can abut on the positioning step (27) to control the range of motion of the rotor assembly (40).

9. The electronic expansion valve according to claim 1, wherein the first stop protrusion (211), the second stop protrusion (221) and the third stop protrusion (41) are all plastic parts.

10. An electronic expansion valve according to claim 1, further comprising a sleeve (50), wherein the sleeve (50) is connected to the valve seat assembly (10) and forms a receiving cavity with the valve seat assembly (10), the first connection port (11) and the second connection port (12) are located outside the receiving cavity, and the nut assembly (20), the valve needle assembly (30) and the rotor assembly (40) are located inside the receiving cavity.

11. An electronic expansion valve according to claim 10, wherein the valve seat assembly (10) comprises:

a valve seat (13), the valve seat (13) having the first connection port (11) and the second connection port (12), a portion of the nut assembly (20) extending into the valve seat (13);

the sleeve seat (14), the sleeve seat (14) sets up in the valve seat (13) outside and with the valve seat (13) are connected, sleeve (50) with the sleeve seat (14) are connected.

12. A method of installing an electronic expansion valve, the electronic expansion valve being an electronic expansion valve according to any one of claims 1 to 11, the method comprising:

assembling the components of the valve seat assembly (10) of the electronic expansion valve together;

assembling together components of a valve needle assembly (30) of the electronic expansion valve;

extending the reducing section (31) of the valve needle assembly (30) into the nut assembly (20) from the large-diameter section (22) of the nut assembly (20) of the electronic expansion valve, and screwing the reducing section into the small-diameter section (21) of the nut assembly (20);

mounting the nut assembly (20) to the seat assembly (10);

mounting a rotor assembly (40) of the electronic expansion valve outside the nut assembly (20), abutting a third stopping protrusion (41) of the rotor assembly (40) with a second stopping protrusion (221) of the nut assembly (20), adjusting the distance of the valve needle assembly (30) extending into the valve seat assembly (10), fully closing the electronic expansion valve, and connecting the valve needle assembly (30) with the rotor assembly (40);

and sleeving a sleeve (50) of the electronic expansion valve outside the rotor assembly (40) and connecting the sleeve and the valve seat assembly (10) together.